The game is only marked as coming out on Windows on the steam store. Lots of developers use Macs/Linux so it might get a tad more attention if you add them to. Is there a reason you haven't added them?

------------------------------------------------My in-game name is MrChris

I don't have any Linux or Mac hardware to test and debug the game.I fear it may be bad for the reviews (which heavily determine if a game is successful on steam these days) if the Linux or Mac version has a but I can't reproduce or fix.